Thermodynamics Test

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Thermodynamics Test - 4

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Weekly Quiz Competition

Question 1
1 / -0

Spontaneity in the context of chemical thermodynamics means

A
having the potential to proceed fast.

B
having the potential to proceed instantaneously.

C
having the potential to proceed with the assistance of external agency.

D
having the potential to proceed without the assistance of external agency.

Solution

Spontaneity means a reaction occurring on its own without any help of external agency.
Question 2
1 / -0

Entropy is a state function and measures

A
the enthalpy of the system.

B
the degree of randomness or disorder in the system.

C
the degree of regularity or order in the system.

D
the internal energy of the system.

Solution

Entropy is a state function and it measures degree of randomness or disorder of a system. It is denoted by 'S'.
Question 3
1 / -0

If change in Gibbs energy ΔG is negative (< 0) at constant pressure and temperature

A
the process is non spontaneous

B
the process is spontaneous

C
the process will rarely take place

D
the process will never take place

Solution

ΔG gives a criteria for spontaneous and non spontaneous process at constant temperature and pressure. ΔG < 0 (negative) means reaction is spontaneous and ΔG >0 (positive) means reaction is non spontanenous.
Question 4
1 / -0

Standard Gibbs energy change Δ_rG⁰ is related to the equilibrium constant of the reaction as follows:

A
Δ_rG⁰ = -nRTln K

B
Δ_rG⁰ = -Rln K

C
Δ_rG⁰ = -Tln K

D
Δ_rG⁰ = -RTln K

Solution

Δ_rG⁰ = -RTln K

whereΔ_rG⁰ is standard Gibbs energy change, K is equilibrium constant, R is universal gas constant and T is temperature in kelvin scale
Question 5
1 / -0

A thermodynamic state function is a physical quantity whose value

A
determine PV work.

B
depends on temperature only.

C
independent of path.

D
determine heat changes.

Solution

State function is one which is only dependent on initial and final state of the system and is independent of the path by which that change has occurred.
Question 6
1 / -0

For an adiabatic change

A
ΔT = 0

B
w = 0

C
Δp = 0

D
q = 0

Solution

An adiabatic process would not allow exchange of heat between the system and surroundings, hence q=0.
Question 7
1 / -0

By convention, standard enthalpy for formation of an element in reference state is:

A
different for each element.

B
unity

C
< 0

D
zero

Solution

By convention, enthalpies of formation of all elements in their most stable state of aggregation (reference state) at 25^oC and 1atm is taken as zero.

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Thermodynamics Test - 4

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Thermodynamics Test - 4

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Question 1

having the potential to proceed fast.

having the potential to proceed instantaneously.

having the potential to proceed with the assistance of external agency.

having the potential to proceed without the assistance of external agency.

Solution

Question 2

the enthalpy of the system.

the degree of randomness or disorder in the system.

the degree of regularity or order in the system.

the internal energy of the system.

Solution

Question 3

the process is non spontaneous

the process is spontaneous

the process will rarely take place

the process will never take place

Solution

Question 4

ΔrG0 = -nRTln K

ΔrG0 = -Rln K

ΔrG0 = -Tln K

ΔrG0 = -RTln K

Solution

Question 5

determine PV work.

depends on temperature only.

independent of path.

determine heat changes.

Solution

Question 6

ΔT = 0

w = 0

Δp = 0

q = 0

Solution

Question 7

different for each element.

unity

< 0

zero

Solution

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Δ_rG⁰ = -nRTln K

Δ_rG⁰ = -Rln K

Δ_rG⁰ = -Tln K

Δ_rG⁰ = -RTln K